Dual Channel SLIC/Codecs with DTMF

Overview

The Le77D11 dual-channel Voice over Subscriber Line Interface Circuit (VoSLIC™) device has enhanced and optimized features to directly address the requirements of voice over broadband applications. Their common goal is to reduce system level costs, space, and power through higher levels of integration, and to reduce the total cost of ownership by offering better quality of service. The Le78D11/Le77D11 is a two-device chip set providing a totally software configurable solution to the BORSCHT functions for two lines. The resulting system is less complex, smaller, and denser, yet cost effective with minimal external components.

The Le77D11 Dual VoSLIC device requires only two power supplies: +3.3 VDC and nominally +12 VDC, but can range from +8 to +40 VDC depending on the application. A single TTL-level clock source drives the two switching regulators that generate the required line voltage dynamically on a "per line" basis. Six programmable states are available: Low Power Standby, Disconnect, Normal Active, Reverse Polarity, Ringing and Line Test. Binary fault detection is provided upon application of fault conditions or thermal overload.

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